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Relating to the forces of air in motion.

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A combination of aeronautics and space.

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A mixture of gases that contains approximately 78% nitrogen, 21% oxygen, and 1% other gases.

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Any machine that is capable of flying through the air;

included are ultralights, airplanes, gliders, balloons, helicopters, hang gliders, and parasails.

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An aircraft that is kept aloft by the aerodynamic forces on its wings and  thrust forward by a means of propulsion. 

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A component, such as a wing, that is specifically designed to produce lift, thrust, or directional stability.

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A place on either land or water where aircraft can land and take off for flight.

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Height above sea level or ground level, expressed in units. 

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The art, science, and technology of flight within the atmosphere.

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A person who operates an aircraft in flight.

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The curved part of an airfoil, from its leading to trailing edge. 

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A line drawn through an airfoil, from its leading to trailing edge. 

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The downward movement of air behind a wing in flight.

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A force that slows the forward movement of an aircraft in flight.

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Forces in motion.

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The natural force pulling everything to Earth.

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The front part of a wing or airfoil.

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The upward force that opposes gravity and supports the weight of an aircraft.

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The flow of air that moves opposite the flight path of an airplane. 

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The force that moves an aircraft forward in flight.

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The upward movement of air ahead of the wing in flight.

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A spinning column of air that is created behind the wingtip as a result of air moving from an area of high pressure on the bottom to an area of low pressure on top.

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Air in motion.

(a)